<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <h1>首页</h1>
  <form action="/add?_csrf=<%=csrf%>" method="post">
    用户名： <input type="text" name="username">
    密码： <input type="text" name="password">
    <button type="submit">提交</button>
  </form>
</body>
</html>